AMD
HIS ATI Radeon HD 5850 iCooler V 1024MB GDDR5 PCI-Express Graphics Card - £204.99
AMD Phenom II X4 Quad Core 955 Black Edition "125W Edition" 3.20GHz Retail - £117.49
Asus M4A87TD Evo AMD 870 (Socket AM3) DDR3 Motherboard - £86.99
Corsair XMS3 4GB (2x2GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit - £76.36
Sapphire Pure 625W Modular Power Supply - £49.98
Antec 300 Three Hundred Ultimate Gaming Case - Black - £48.99
Samsung SpinPoint F3 1TB SATA-II 32MB Cache - OEM (HD103SJ) - £42.99
Akasa AK-CCX-4002HP Venom CPU Cooler - £35.99
LG GH22LS50 22x DVD±RW SATA ReWriter Lightscribe Drive - Retail - £14.09
Sub Total : £576.91
Shipping : £11.75
VAT : £103.02
Total : £691.68
*EDIT*
for £700 shop purchased you wont get anything semi decent im afarid
Not entirely true, OcUK have some decent £700 prebuilts, the "Titan Cyborg" is very good value for what it offers(quad core,gtx470) its nearly similar to my spec